Industrial touch displays have extremely high performance requirements due to the harsh environments such as high and low temperatures, dusty, watery and oily environments in industrial applications. Especially in the high and low temperature environment, it is a great challenge for industrial display products. Then, the high wide temperature performance of industrial displays is very necessary.
There are two methods of low-temperature heating: point-by-point heating and full surface heating. This will increase the overall power consumption of the monitor by 4-6 times. For example, the power consumption of 15-inch LCD monitor at room temperature (22 ℃) is 20ww, in the low-temperature environment (-40 ℃) power consumption of 90-120w. This heating method makes the machine in the process of long-term use, sometimes there will be liquid crystal outflow or difficult to restore the situation.
By developing a special high-voltage bar (can produce 2000v-3000v starting voltage), the backlight tube is turned on in a low-temperature environment (-40℃), and the liquid crystal heats up due to the huge heat generated by the backlight tube. It solves the problem of liquid crystal working at low temperature and also solves the problem of visibility in sunlight. This method is called the brightening method.
Liquid crystal does not freeze or undergo state transition at low temperature, otherwise neither the heating method nor the brightening method works, so we thought of using software to correct the drift of its electrical characteristics. Try to trigger the operation of the liquid crystal at low temperature. This requires adjusting the driving timing of the liquid crystal, etc. Through a lot of experimental research and extensive applications, this technology has become very mature. No matter how the ambient temperature changes, by widening the trigger sequence and matching the corresponding drive, the normal operation of the liquid crystal can be ensured.
Capacitive touch screen works by using the touch sensor to induce a voltage on the conductor on the screen, thus generating a relative current to measure the touch point through the distance. In the case of low temperature, the skin surface of the hand has low water content, and the dry and cold skin conducts electricity poorly. At the same time, when the ambient temperature is low, the performance of the sensor will also be affected, industrial touch screen can not be well recognized touch location, resulting in touch screen failure. Touch screen operating temperature is usually between -5 ° C to +60 ° C, especially in winter, the northern regions are more affected.
Resistive touch screen is less affected. On the one hand, due to the use of different processes, the microcircuit on the touch screen is connected to work, the temperature is less affected. On the other hand, the technical level of resistive screens are more mature, the materials used are tested and can continue to use. Resistive screen temperature requirements between -20 ℃ to 65 ℃, can meet most of the use of the environment.
Infrared touch screen accuracy is completely independent of current, voltage and static interference, suitable for a variety of light pollution environmental conditions. However, infrared touch screen is limited by the single sensor, easy to damage and aging, and the touch interface can not withstand pollution, destructive and complex maintenance. When the temperature is extremely low, industrial displays are prone to dust absorption due to static electricity generated during use, which affects usage. It is suitable for aerospace field.
TOUCHTHINK industrial grade displays can meet your needs. The front panel is designed with brushed aluminum process and harmonious curved edges; at the same time, the touch control method supports five-line resistive capacity and wide temperature LED backlight LCD. The whole machine wide temperature performance by long-term controllable high and low temperature standard test.... In addition, in the whole machine materials pay more attention to its reliability, environmental adaptability, real-time, scalability, EMC compatibility and other performance.
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